基桩施工产生的废弃泥浆絮凝脱水后的土体工程性质研究  

Study on the Engineering Properties of Soil after Flocculation and Dehydration of Waste Mud in Foundation Pile Construction

作　　者：张达志 ZHANG Dazhi(Sinohydro Bureau 5 Co.,Ltd.,Chengdu Sichuan 610066)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610066

出　　处：《四川水力发电》2024年第S02期29-34,共6页Sichuan Hydropower

摘　　要：针对基桩施工产生的废弃泥浆进行脱水处理的常用方法之一,是在其中加入絮凝剂后装入土工袋进行脱水。阐述了针对雄商高铁站前8标基桩施工的实际情况,采用土工袋模型试验的方式研究了脱水龄期、絮凝剂种类、土工布种类对脱水后的絮凝土工程性质的影响。研究结果表明:随着脱水龄期的逐渐增大,絮凝土的含水量迅速减小、密度逐渐增加至逐步稳定,其黏聚力和内摩擦角逐渐增大、强度逐渐增加,与含水率成反比关系、与密度成正比关系;不同类型的土工布对絮凝土的性质影响不大。因此,可以选择强度较大的编织土工布以提高土工袋装泥浆土的整体强度。研究发现:单独投加质量比为5%的CPAM或组合投加质量比为3%的PAC和4%的NPAM获得的絮凝土28 d强度相对较高,其工程性质能够较好地满足工程应用要求,对其稍作处理即可用于路基填筑工程中。One of the common methods for dehydration of waste mud in foundation pile construction is to dehydrate with geobags after adding flocculant.Combined with the construction of foundation piles of the 8 sections in front of Xiongshang High-speed Railway Station,the geobag model test was used to study the influence of the dehydration age,the type of flocculant and the type of geotextile on the engineering properties of flocculation soil after dehydration.The results show that,with the gradual increase of the age period,the water content of flocculation soil decreases rapidly and the density gradually increases to gradually stabilize,its cohesion and internal friction angle gradually increase,the strength gradually increase,which is inversely proportional relationship to density;different types of geotextile have little influence on the properties of flocculated soil.Therefore,the woven geotextile with higher strength can be selected to increase the overall strength of the mud soil in geobags;The study finds that the 28-day strength of the flocculated soil obtained by adding CPAM with a mass ratio of 5%alone or PAC and 4%NPAM with a mass ratio of 3%and 4%is relatively high,and its engineering properties can better meet the requirements of the engineering application.It can be used in subgrade filling and other projects after a minor treatment.

关 键 词：雄商高铁站前8标 泥浆 脱水 絮凝剂 土工织物 抗剪强度 工程性质 

分 类 号：U215[交通运输工程—道路与铁道工程] U215.1U215.7